Mining machine



May 15,

M. P. HOLMES MINING MACHINE 8 Sheets-Sheet 1 Filed Feb. 19, 1923 May 15,1928.

M. P. HOLMES MINING MACHINE 8 sheets-sheet 2 Filed Feb. 19, 1923 i J7 5337/36 77 7b 105/ May 15, 1928. 1,670,155

M. P. HOLMES MINING MACHINE Filed Feb. 19, 1925 8 Sheb-Sheet 3 4% 5'4 I:15 i 15 M5 41 V. X IRE:

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. M. P. HOLMES MINING MACHINE May 15, 1928. I 1,670,155

Filed Feb. 19, 1923 8 sheets-shed 4 May 15, 1928.

M. P; HOLMES MINING MACHINE Filed .Felll 19, 1925 8 Sheets-Sheet 5 i Ymg Q May 15, 1928. 1,670,155

M. P. HOLMES MINING MACHINE File d Feb. 19, 1925 a Sheets-Sheet s May15, 1928. v 1,670,155 M. HOLMES MINING MACHINE Filed Feb. 19, 1923 I 8 st -sh t '7 May 15, 1928.

M, P. HOLMES MINING MACHINE Filed Feb. 19. 1925 8 Sheets-Sheet 8 it a rPatented May 15, 1928.

MORRIS ,;P. HOLMES. or CLAREMONT, NnwHAivrrsHmE, Ass'Ienoa T0 SULLIV N IMACHINERY COMPANY, CORPORATION OF MASSACHUSETTS.

MINING MAoHInn Application filed February 19, 1923. Serial No. 619,839.

iy'invention relates to mining machines.

It has for its object to provide an improved-mining machine. A furtherobject of my invention is to provide such a machine of improved and verycompact construction especially adapt-ed to-usein low vein work. A stillfurther object of my invention is to provide an'improved machine whichis without change adapted to operate as an over or under cutterl'Further and more specific objects of my invention 1nclude the provisionof an improved motor and motor' supply and control mechanism,

improved flexible feeding mechanism, im-

proved cutting mechanism, and improved transmission mechanism betweenS211Cl flexiblci feeding and cutting mechanisms and said motor includingimproved controlling mechanism. These and other objects and advantagesof my improvement will, however, hereinafter more fullyappear.

In the accompanying drawings I have shown for purposes of illustrationone embodiment which my invention may assume in practice.

In these drawings.

Fig. 1 is a plan view of a machineconstructed in accordance with thisembodiment of my invention, the'cut-ter bar being illustrated indifferent,- positions. v Fig. 2 is a side elevation of the machine shownin Fig. 1, apart of the frame being broken away to facilitateillustration.

3 is an enlarged plan view partially in section of the cutter barcarrying end of the machine. 7 a

Fig. 4c is a longitudinal sectional view on line l st of Fig. 3.

Fig. 5 is a transverse sectional view on line 55 of Fig. a

Fig. 6 is a detail sectional view on line 6+6 of Fig. 41, mechanism. 7 y

Fig. 7 is an enlarged horizontal sectional view ofthc motor and itssupply connec-' tions.

Fig. 8 is a lines 8-8 of Fig. 7.

Fig. 9 is a transverse sectional viewon line 99 of Fig. 7.

Fig. 10 is an enlarged detail view of the oiler mechanism. v

Fig. 11 is an enlarged longitudinal sectional view or" the feedingmechanism on line l1 1'1 of Fig.- 1.

showing the bar locking Fig. 12 is a transverse sectional view on line1212-of 11, showing the reverse gear.

friction controlling mechanism.

Fig. 1411s a longitudinal sectionaljview Fig. 17 is a similar viewshowing the machine adapted to make a longwall cut in.- ghc oppositedireotion'oii a similarly located ace. i 18 is a similar view'showingthema chine adapted to cut in'one direction on an oppositely located face.Fig. '19 shows the machine arranged for a reverse feed along a face. i I

Fig. 20 1s a similar view showing the machine arranged for fast feedabout the mine.

Fig. 21is asidefelev'ation of the 'machine shown in Fig, 2' when adaptedtoop'erate on'askid. f T -IFig. 22 is a similar view showing the machineof Fig. 2 adapted to operate as a top cutter. r v

Fig. 23 is a diagrammatic plan view show- 'ing one method of-operating'the machine to make a cut extending a rib. I

Fig;- 13 is a similar transverse sectional partially in elevation online 14 14.-of Fig.

Fig. 243s a' similar view showing. another,

method of operating the machine to make.

Fig. 25 is a similar viewshowing the a similar cut.

machine operating as a room and'pillar ma.- chine in a heading. I g "Inthis illustrative construction I have shown my invention applied to anair-pro polled flexibly fed miningmachine of the 'longwall type adaptedto slide on its bottom 1 on a mine bottom and carrying on "one end apivoted cutter bar 2, the construction being such that after the cutterbar has been inserted under the face. the frame portion of the machine,generally indicated-atfi,

may be disposed substantially at right angles to the. cutter barandmoved longitudinally along the face and relative to flexible feedingmeans of any suitable form, herein including a flexible feeding member 4likewise disposedalong the face and operatively connected to theopposite end of the machine from the cutter bar;

Referring more particularly to the machine, it will'be noted that thesame herein comprises three sections, i. e. a motor section 5, a feedsection 6, and a cutter carrying section 7, the feed and cuttermechanism carrying sections being herein disposed at opposite ends ofthe motor sect-ion and rigidly connected to the latter at points abovethe bottoms of the sections, as by a series of bolit connections 8preferably disposed in side pockets in the isectionsoand 6 as illustrated in Fig. 2, in suchinanne'r as .to form a rigid exceedingly lowframe slidab'le on the mine bottom. More particularly it will be notedthat hereinthe upper and lower surfaces of the three sections 5, 6, and7 are, as preferably, disposed in .the same plane in such manner as tounite; to form a single 'ders 1.7 on a shaft 18'to which one of thehelical tooth sections is keyed as at 19. In

' ferent shafts.

shoe adapted to permit free movement of the machine thereon over themine bottom.

rotors 9, .10 each preferably having between their oppositely disposedsets "of helical teeth, a spur gear 13 meshing with its fellow. Moreparticularly it will be observed that each of these rotors comprises aplurality of oppositely disposed helical portions14 on opposite sides ofa spur gear and that these elements are. clamped together by a pluralityof bolts15 carrying on their ends clamping rings 16 engaging oppositeshoulthis connection attention .is directed'to the fact that-as viewedin Fig. 7 the right hand helical section of one rotor is keyed to oneshaft while the left hand section of the other rotor is keyedfo theother shaft, in such manner :as to enable identical rotors to beutilized on the two shafts,.the rotors being simplyopposi'tely mountedonthe diftheir shoulders 17 which in turn are supported in motor headmembers 20, 21 seated in the opposite ends of the casing and hereinhaving flanges 22 adapted to position the same relative to the casing,suitable ball It will further be noted that the shafts 18have reducedportions adjacent,

bearings 23 preferably being provided between further reduced portions24 On the shaft and the heads. I

Operatively associated withv the rotors above described is improvedmeans for supplying pressurefluid thereto and exhausting the. sametherefrom. In a preferred form, a pressure fluid supply pipe 25,preferably having a suitable throttle therein (not shown), is suitablyconnected through ausual strainer 26' with a removable supply connection27 rigidly connected to 28, 29 to one side of the cutter carryingportion 7. Herein this, connection is adapted: to fit around the curvedfront head on the portion 7 and includes an elongated passage 30 com.-municating through a suitably bushed or packed opening 31 with a chamber32 formed .in the section 7. This chamber 32 in turn communicates with alongitudinally extending passage 33 passing through the head .21 throughsuitable packed joints and extending longitudinally of the center lineof the sect-ion 5 beneath the mesh line ofthe rotors :9 and 10, to apoint below the spur gear sections 13 where it communicates with a plainupwardly extending motor inlet 34, thus supplying motive fluid to therotors in such manner as to'cause the same'and their shafts to rotate in:a well known manner in the opposite directions indicated by the arrowsin Fig. 9., As shown herein, the exhaust from the rotors passes out ofthe opposite ends thereof into end exhaust chambers 35 communicatingthrough baffle chambers 36with outlets 37 disposed two in a setvertically at the opposite ends ofeach side of the motor section 5, thebaffles serving to prevent the entry of foreign matter such as coal intothe rotor casing when the rotors drawa vacuum in the casing as the motorIOU is shutdown. Here attention is also directed to the fact that alongitudinal passageway 38 is provided above the mesh lineof the. rotorsconnecting the two end exhaust chambers.

In my improved construction the pressure fluid supply connections forthe motor are made reversible. It will be noted that the pressure fluidsupply connections are made to that side ofthe machine which is-remotefromthe face during the making of the longwall cut and provision is madewhereby these connections may be changed from one side to the other asmay be desirable when the machine is to cut in opposite directions alongthe face. :To make this possible the section 7 is provided with aplurality of passages 31 while the chamber 32 is branched andcommunicates with the passages 31 on opposite sides of the machine sothat the connections 25, 26,27, 28, 29 and 30 may disposed at eithersideof the machine as may be desired. Here it will also be noted that acover plate 39 is at- Y or hand wheel 52 on the end of thefeed sec-g mgand a suitable lock nut 70, While the tached by screws 40 over theunused. passage 31 through which the passage 30 Would communicate withthe unused chamberBZ, and understood that the section 7 is also suitablybilled to receive the bolts 28, 29 when the section 27 is reverselydisposed. It will also be understood that both branches of the chamber32 communicate with the passage 33 and consequently with the motor. i

Here attention is also directed to the con trolling mechanism for thefluid pressure supply which is preferablyprovided in ad dit-ion to the.usual valved supply connection 25. More particularly, it will beobserved that a hollow tubularthrottle valve 41 haV- inga-longitudinallyextending slot or aperture -12 th erein is'jouri'ialedin the passage 33 immediately beneath the motor inlet 34, this throttlevalve 41 being rotatable on a horizontal axis in such manner thatrotation of the same acts to throttle more or less as desired the supplyof pressure fluid from the passage 3,3 to the motorinlet 34. Moreparticularly, it will benoted that thisvalve L1 which ispreferably soconstructed as to be expanded by the fluid pressure in such the head 20and carries on a protruding end a pinion 44lmeshlng with teeth onartransversely disposed .racl; member 4c5ihey ed at 46 to a transverserod 47, l1kewise connected thereto by a set screw 48, therod47 in turnbeing mounted for; transverse reciprocating movement when desired insuitable bearings inv the section 6 and carryinga similarly site endmeshing with the teeth of a pinion 50 on a longitudinally disposed shaft51 which isin turn rotat-able by a rotatable disc tion 6. r I vCooperating with the motor mechanism is i also. improved lubricatingmechanism there for. Th s mechanismherein comprises a plurality oflubricant chambers 53, 54:,

formed in the frame of the section 5 above the horizontal median planethereofand a plurality of similar lubricant chambers 55, 56 below thatplane. Herein one of these chambers 53 communicates with the bore forthe rotor 9through a small .air passage 57 and alsov through arestricted oil discharge 58 located adja ent the bottom of the chamberand controlled by a valve 59 operatively connected, as through a pin'60, withan ad justing screw 61, in turn operable by an ad justing knob62 disposed in arrecess 63 in the side of the section 5 substantiallymidway between the top and bottom thereof.

'lnus it will be noted that the construction such when the knob 62 isadjusted,

thefair pressure'passingfrom the rotor chamberintovthe chamber 53 andacting on the top of the oil therein forcesthe oil out t-hrough the'aperture 58 and into the rotor chamber into the path of the pressurefluid in such manner as to lubricate the rotor. Referring to the chamber54, it will be noted thatihe, same is not provided with a valve:

but that instead the opening in which the member .61 wouldbe seated isplugged by a plug 64vand that similar plugs close the chambers;55, 56,this arising from the fact that the chamber 54 is only used when thatside of the machine is away from the coal face and therefore.accessible,the plug 64 then closing the chamber 53, while the chain bers 55, 56areonly used under likecircumstances whenthe machine is turned bottom sideup and operating with the topsurface shown vin =Fig. -9ufor1 ning :itsshoe, all as hereinafter more. fully described; Here it will alsobenoted that these chambers may be filled through removable tWopartscreened plug connections, 53', 54, 55and 56 in boththe top, and bottomsurfaces of the machine.

Operative'ly connected to themotor here lnabove described is the cuttingmechanism including the cutter bar 2. More particularly it will be notedthat this cutting mechanism includes a cutter bit carrying-cutter "chain65 circulated about the bar by. a cutter chain sprocket 66 suitablydriven by one or the other of the rotors 9, 10 as circumstances require.Referring more in detail to the driving connections, we will firstconsider the-connections to the rotors. Here f it will be observed thatthe *shafts 18 of the ,i'otors 9, 10 each have still further reducedconnectedrack 49, see Fig.- 13, on its oppo-- 68, 69 thus rotating inparallel but longitudinally spaced transverse planes. Selectively'cooperating with these pinions 68, 69

is an adjustable pinion 72 splined 'on a longitudinally extending shaft73 disposed between the rotor shaftsiandsuitably jour-. vnaled on thehead 21 in a ball bearing 7 l and at its front end on a frame member 75on theksection .7111 aball bearing 76. As illustrated, this 131111011 72also has a clutch, shipper ring 77 formed thereon and adapted to beengaged by a horizontally end oftheredu ced portion 67. on the shaft".

of the rotor 9 and disposed thereon closely adjacent the bearing 23',the two pinions' disposed U-shaped clutch shipper'78 pivoted on aVertical axis at 79 on the section 7 and having a worm gear sector 80,partially" surrounding'lts pivot, adapted to mesh witheworm 81-on atransverse shaft 82 j ournaled on the section 7 and extending above theshaft 73 when the parts are disposed as shown in Fig. 1. As illustrated,the shaft '32 is journaled in a suitable collar 83 threaded in thesideof'the section 7 and has .keyed on its end suitable knob 8 1 enabling itto be rotated at will, suitable provision, as by elongating theoppositeend of the shaft it 85, being-made so that this knob may be transposed:to the opposite side of the machine to permit suitable access andoperation whatever side of the machine is adjacent the .ztaoe, Thus, itwill be observed that depending upon the adjustment of the shipper 78.,ithe pinion 72 and consequently the shaft 73.1nay be rotated fromdifferent rotors and in opposite directions without reversing the motor.I 1

Referring next to the operative connections between the shaft 7 3 andthe cutter .chain sprocket 66., :it will be noted that the shaft 73carries adjacent its bearing. a

87 a spur pinion $91 which meshes with 'a larger horizontally disposedspur gear 92' having a depending sleeve journa led on vertically spacedroller bearings 193, 94 which in turn surround. a (central vertical stud95.

This stud as shown is pinned to the cover plate .90 to prevent rotationo'f the stud and is also provided with reduced threaded portions 96.,9?? on its endsthreaded into small removable plates-98, '99 respectivelyattached byscrews 1 00, 101-t'o th-e coverlplate -and a bottom plateorshoe 102 forming a rigid continuation oi' the :bottom of the machine andAs ilattached to the framewmem'ber 75.

' ;lustrated,.:the depending sleeve on the gear 92 is connected through.a semi-permanent clutch connection 103 with the upper end of a similarsleeve 104 on the sprocket 66, the ends of :the sleeve 10 1 beingsimilarly ,journaled on axially spaced ball bearings 105., 106surrounding the lower end of its stud and tile bearings being spacedfrom and located relative to the bearings 9 1 by a flange 105" onthe-stud. Moreover, the sleeve-on the gear ,92 and the upper portion ofthe sleeve 10 1 are enclosed within an outside sleeve member 107 fixedto the frame by screws as at 108, while a complementarycup thrustbearing member 109 seated vin the aperture for 1 the plate 99 and towhich the lower end of the stud is also pinned, receives thelower end ofthe sleeve 104. Thus, it will be noted that rotation imparted to theshaft 73 acts through the" vertically compact reducing gearing described to rotate the sprocket 66 to give the desired speed tor :thecutter chain.

Here it should also 'be observed that by reason-of the cover plate 90and the construction hereinabove described, it is made possible forthe-sprocket and sprocket bean ings to be removed when desired and torthe cutter bar '2 to be withdrawn. More particularly it will be notedthat upon re moval of the cover plate-90 it is possible toflii'tt outthe gear 92 with its'bearings, remove the member 107, remove the plate99, anddrive out the stud 93 in'such man ner as to permit raising of thecup bearing 109 and sprocket 66 sufficiently to cause the bearing 109 toclear its seat and consequently permit longitudinal withdrawal of thebar 2, sprocket 66, and cupbearing 109 as a unit andsubsequent readyseparation of the same Wheneverdesired. It will also be noted thatsuitable ielt rings 110, 111 are inserted between the adjacent ends orthemembers 107, 109 and the sleeve 10 1 on the sprocket to exclude dirtand the like from the inner bearings. Here attention is di rected to thefact that a member 112 fixed to and forming a journal for the bar 2 isjournaled on the lower end oithe sleeve 10? above the' 'sprocket 66 andthat a similar member 113 integral with the bar' 2 is jour naled on 'themember 109 below'the sprocket, suitable bearing sleeves 114 and115 beingkeyed within the members 112, 11 3 and permitting free swinging of thebar.

lu-my improved construction it will also be'noted: that "improved meansare provided for holding the cutter bar in differentposh tions ofadjustment about its pivot on the members 107 and 109. As shown hereinthe member 112 is formed in a separate piece 116 fromthe member 113whichis integral with the bar and the member 116 is attached by one ormore screws 117 at points at one I side of 'the sprocket axis in suchmanner as to produce a strong but readily separable construction. 2Moreover, it will be noted that the piece 116 which carries the member112. is providedwith a vertical' bore 118 in an upstanding boss 1'19grooved to overlie and if necessary to be supported on the edge of thehead to maintain the bar in the desired plane of swing, andthat arotatable locking pin 120 is seated in this bore andprovided with aremovable flange 121 on'its lower end. seated .in a larger bored-outportion 122 in the bar '2 in such manner as to prevent lonspendingcut-awayportions 124 on the front will rotate theportin'123 of the pin120 into or out of operative engagement with any one of the recesses 12%when it reaches. the same and thus automatically lock the bar when thelatter is turned to the right or .ieft, the desired pull herein beingobtained by operation of the feeding means hereinafter described.Attention is also directed to the hook 126 which it will be noted is ofsuch length as to hold up the end of the feed chain 4 and thus preventthe same from being entangled in the cutter chain should the feed chainbreak or a jack give way, the length of the hook and its connection tothe pin being such that in either disposition thereof the end of thefeed chain connected thereto is maintained at the necessary distanceaway from the cutter bar to insure freedom from conflict. "Referringmore particularly to the hook it will alsobe noted that the same isprovided with an elongated slotted end 127 enabling'the desired .free

-' dom of movement of the hook relative to the head and to the. pin 120as the bar is swung about-the head. While referring 'to' this mechanism,it should also be observedthat the boss 119 is provided with a roundedsurface adapted to form a curved rubbing face engageable with the coalface to protect the mechanism from'injury.

Having thus considered the cutter bar carrying end of the machinecarried on the section 7, we will now refer tothe feeding mechanismcarried on the section 6 and 00- operating with the flexible feedingmeans 4, the latter herein assuming the form of a feed chain. In mypresent construction these means include, fast and slow feedingmechanismadapted to rotate 'a feed operating member 128, hereinafter more fullydescribed, engageable with the feed chain 1 and herein disposed on theend of the section (Jon a horizontal axis extendinglongitudinally of themachine. Referring more particularly to this feeding mechanism includ-'ing the driving connections between the motor and the feed operatingmember, we will first consider the fast feed ordinarily used in movingthe machine about the mine and swinging the bar when not cutting, 'al-'though it should be understood that this fast feeding mechanism and moreparticularly my improved mechanism may be usedduring cutting whencutting conditions. are favorable,

Considering this 3 fast feed "mechanism more specifically, it will benoted that the opposite endof the rotor 9 from that previouslyconsidered i'nfconnection with the drive for the cutting mechanism,is'provided with a reduced portion 129 shorter than a its oppositereduced portion 67 and having keyed thereto andsuitably attachedtheretoby a lock nut 130, a pinion 131 which meshes with a larger spur gear 132suitably carried in a chamber 133 formed in the, head and journaled insuitable ball bearings134 carried on the head. :This gear 132 is in turnrigidly connected as' by keying to a driving pinion 136 disposedcoaxially therewithjand outside the headand held in assembled relationto the bearings 13 1 by'a bolt connection 135,"which pinion in turnmeshes with aspur gear 137 keyed to a short longitudinally disposedshaft 138 journaled in suitable bearings 139-carried by a ring section 110 receivable in a corresponding longitudinally disposed and centrallylocatedbore 14:1 extending throughout'the length the section 6. Thisring section 140 is adapted to be inserted or removed longitudinallyfrom the rear end of the section 6 and, as herein, preferably has acut-away'portion 142 to permit free rota tion'of the gear 137, a webportion 143 in which one of the bearings139 is carried, and a. hubportion 144 inwhich a bearing 1&5 for one end of a, longitudinallydisposed horizontal main feed driving shaft 1&6 is" journaled. As "shownthe shaft 138 and gear 137 are suitably located relative to the bearings189 by suitable bearing'rings 147- and the shaft has one end protrudingfrom one bearing and carrying a pinion 148 thereon which in turn mesheswith a larger internal gear 149, the pinion and bearing being on asleeved clutch member 152'keyed to the shaft 1416' and both are spacedfrom the bear v ing 1&5 by a sleeve 151. -Herein', it will also be notedthat themember'152 carries a series of friction discs 153, surroundingthe held in assembled relation by a bolt con' nection of the same typeas the bolt connection The hub 150 ofthis gear'is herein; 'journaled ona suitable bearing sleeve 151 member 152 and disposed within a sleeve onthe internal gear 149, which cooperate with v a corresponding series offriction discs 15 4;

carried by the sleeve on the internal gear.

As shown, the sleeve on the internal gear is also provided with aplurality of radially located longitudinally extending aperturesf 155receiving radial fingers or extensions 156 on an interlo'ckmg member 157keyed to a pinion 158 which is in turn free'lyrotatable Y .on the shaft146, while between these fingers 15G friction clutch operating fingers159, carried on a disc 160 disposed coaxially with the hub of the member157 ,extend longitudinally into contact with one set of friction discs.

shaft 146 is also journaled in a suitable ball tween thepinion and thebearings.

bearing 161 carried in the hub 162 of a ring section163,similar to thesection 140, and alpinion 164, like the pinion 158, is keyed to theshaft at a point adjacent the bearing .161. v This pinion in turn mesheswith a gear 165, identical with the gear 137, keyed to a short.longitudinally extendingshaft 166' 149, disposed coaxially with theshaft and on the opposite side of the web of the ringsection 163. Thisinternal gear 170 is in turn keyed toa'n enlarged portion on a shortlongitudinally extending shaft 171 extending. coaxial'lywith the shaft146 and through the" feed operating member 128. Thus it will be notedthat'the rotation of the rotor 9 will be transmitted through the pinion131, gear 132, pinion 136,;gear 137, pinion 148, internal gear 149,friction clutch 153, 154,

clutch member152, and shaft 146 to the pinion 164, gear 165, pinion 169,internal gear 170, and shaft 171 to the feed operating member 128 torotatethe latter at a predetermined high or fast feed speed whenever theclutch controlling member 160 is operated to connect the clutch. It willhere further be evident that the speed of feed may be lowered atwill'byslip'pii-igthe friction discs 153, 15.4.

Here it will also be noted that the member 128.v isprovided with areduced portion 172 onone .end'j ournaled on a suitable bearing ring 173carried in a correspondingly shaped "opening in a vertically; disposedportion or boss 174 on a frame section 175 forming a rear head forsection 6 and set in the end of the bore,.and having in its head'asimilar coaxially disposed opening carryinga bearing sleeve 176 in whicha reduced inner end of the member 128 is journaled. In order to providefor adjustment of the shaft 171,, it will also'be noted that the end ofthe memher 128 is recessed as shown at 177 to receive. a correspondinglyshaped clamping member 178 having a flange 17 9 extending radially overthe boss 174, While a screw 180 is extended through this member 17 8 andthreaded into the end of the shaft .171, the opposite end of whichcarries. a collar 181 abutting against the inner surface of thehub oftheinternal gear 170. I

Next referring to the slow or cutting feed, it will. be noted that whentheclutch. operat- As shown the opposite end of the including itsvbearings, to the shafts 138 and 166 and like the shaft 166 preferablydisposed on the opposite side of the shaft 146 from the shaft 138. Hereit will be noted, however, that this shaft 183 is journaled in anotherring section 184 similar to the ring sections 140 and 163 and likewisecarried in the bore141, but in this case spaced from the ring section141 by an intermediate more thin ring section or spacing section 185. Inthis. instance also it will be noted that the hub of the ring sectioncarries a roller bearing 186 for the shaft 146 and that the shaft 183carries a pinion 187 meshing with an internal gear 188 which is suitablyspacedfromthe bearing 186 by a ring 189 located in the same generalrelation as the ring 151 described in connection with the internal gear149. This internalgear 188 is in turn keyed to the sleeve of a pinion190, corresponding to the pinion 158, and this pinion in thisinstancemeshes with a larger reverse gear 191, see Fig. 12, journaled ona supplementary stub. shaft 192, in general similar to the shalt 183 butnot shown in detail. Thusthe rotation of the pinion 190 may betransmitted through the.- gear 191. to rotate a gear 193D meshing withthe'gear 191 and carried on. a shaft 194, similar in all respects to theshaft 183, in such manner as to cause the gear 193 to rotate in areverse direction and accordingly cause the shaft. 194 to rotate in thesame. direction and impart a similar. direction of rotation to itspinion 195 and another internal gear 196, identical with the gear 149.Here it will be noted that these parts arecarried in still another ringsection 19-7,

similar to the sections 163, 184, 140 previously described, and likewisecarrying a ball bearing 198 for the shaft. 146, the hub of the internalgear being spaced. from the bearing by a ring 199. Thisinternal gear 196also houses afriction clutch, generally identical with the constructionpreviously described in connection with the clutch 153, 154, andincluding clutch elements 200, 201,, one of which is carried on a clutchmember 203 keyed to the shaft 146', an'intermediate 164, -and a clutchoperating member 205 surrounding the hub of the. interlocking meniber,although in this. instance the member 204: has no interlocking function,and is only a spacing and disc retaining member. Here attention is alsodirected to the fact that between the ring section 197 and the ringsection 163 a second spacing ring 206, similar in all respects. to thespacing ring 185', is pro 7 member 204 keyed to'the sleeve on the pinionvided and here attention is directed to the fact that all of these ringsandring sections are suitably keyed in thebore 141 as at 207 in suchmanner as to prevent rotationof the same in the bore. As a result of themechanism above described, it will be evident that although the clutch153, 154 is disconnected, rotation will constantly be imparted throughthe pinion 158, gear 182, pinion 187, internal gear 188, pinion 190,gear 191, gear 193, pmion 195, and internal gear 196 so that Wheneverthe clutch 200, 201 is connected, the p1nion 164 will be rotated at aslow or cutting speed in theopposite direction from the fast speedpreviously described in such manner as to conveythrough the gear 165,.pinion 169, internal gear 170, and shaft 171 a simithe disc-like outersurface of the clutch operating member 160. Moreover, it will be notedthat this clutch shipper is' provided with a tail or extension 210extending out through a lateral aperture 211. in the ring 184 into acorresponding chamber 212 formed in the frame section 6 and is thereprovided with U-shaped arms 213 operatively, connected to anon-rotatable nut 214. This nut is herein movable longitudinallyrelative to a threaded portion 215 on a rotatable shipper rod 216 whenthe latter is rotated in a suitable bearing 217 for the end thereofbolted on the ring 185. As shown, this rod 216 has also an extension 218seated in and keyed in the opposite end thereof and having its own outerend suitably journaled at 219 in a bearing sleeve whlch 18 in turnseated in a removable bearing member 220 carried in the head portion ofthe extension 175 whichcloses the end ofthe frame section 6. This rodsection 218 in turn carries another threaded section 221reverselythreaded with respect to the section 215 and also carrying a nut 222cooperating with a clutch shipper mechanism, generally indicated at 223,similar in all respects to the clutch shipper mechanism previouslydescribed and carried by the ring section 185, but it will be noted thatthis shipper mechanism is here carried by the ring section 206 andoperates upon the clutch operating member 205 of the clutch 200, 201. Asillustrated, a spur gear 224 is suitably fixed to the end of the shaft218 and meshes with a corresponding fast feed will be connected toproduce a fast feed and the clutch 20 0, 201 simultaneouslydisconnected, while when the hand wheel is turned in the oppositedirection, the clutch 153, 154 will be disconnected and, the clutch 200,201 connected, to produce a slow feed in the opposite direction.

Operatively associated with the feed op erating member 128 is alsoimproved guiding means for the flexible feeding member 4. These meansare herein disposed upon the frame extension 175 and preferably comprisea plurality of sets of guide sprockets disposed on upright axes onopposite sides of the longitudinal center line of the machine androtatable in horizontal planes.

As shown herein, a guiding member 228 is mounted on a vertical axisclosely adjacent the feed operating member 128 and as shown in Fig. '15slightly below the axis thereof, the sprocket being disposed in suchposition that the feed chain passing off ofthe under side of the feedoperating member 128 may pass around theinner side of the guide 228.This guide is herein also held in position by a suitable screw 229threaded into a vertical stud 230 keyed in anupstanding boss 231 onthe'bottom surface of the section 175,- the screw 229 acting to clampthe stud in posi-. tion relative to an upper boss,232 formed at one sideof the boss 174 and being freely accessible from the end of the section175. A similar guide'sprocket 233 is similarly mounted on the oppositeside of the feed operating member 128 in the same general location. Alsoit will be noted that laterally of each of these members 228 and 233 andherein in transverse alinement therewith, e

larly mounted, the same preferably extend gear 225 fixed to the end of alongitudinally ternal or corner guides 234 and 235 are simiing slightlybeyondthe lateral edges of the I machine frame as shown. Here attentionis also directed to the fact thatjthe upper and longitudinal movement ofi the machine whether operating as a top or bottom cutter, and that, dueto the arrangement andlocation of the feed operating and guidingelements and the open end of the section 175,

access may be readily had to the feed and guide elements to change thearrangement of the flexible feeding member 4 relative thereto asdesired. Attention is also directed to the fact that the wholeextension: 17 5 is herein attached to the section 6 insuch manner as toseal the endthereof and 'therecility as a top or bottom cutter bysimply.

.turning the machine over, the framebei ng so constructed as to permitit to: move" with equal facility on its'top or its bottom, whilethecutting and feeding mechanisms and even the lubricating arrangement aresimilarly adapted to this dual service. More particularly it will beobserved that when the machine is disposed as. shown in Fig; 2 it isadapted to use: as a bottom-cutter whereas when the same is turned overand die posed as. shown in Fig: 22, it is adapted to use asa top cutter,while when mounted-on a Vertically adjustable skid 23 8,it may be eitheran intermediate or top cutter as desired. 'Moreover, it will be observedthat in any relation theflexible feeding means are adapted to cooperateas preferred-in "the same plane as the cutter bar, and: that ineither'position of the machine it is possi ble.

for the. flexible. feeding means: tobe so arranged as to swing the barin thedesired direction to insert i'tlby a suitable movement under thecoal; and then to move the machine bodily longitudinally along the-coal.

face. More specifically considering these.

positions, it will-be noted that with the bar unlocked in a longitudinalortrans-port position, the end of the chain 4; is connected to the hook126 in the manner indicated in Fig. 16 by extending the chain from thefeed operating member 128;along' the inner side of the guidev sprocket233:, outward around the outer side the. guide sprockets 283, 228 and234, and, then. longitudinally along the machine to the hook. Thus apull upon the chain at arfeeding speed, produced by a suitable operationof the hand wheel 227 to connect the. clutch 153. that, causes the barto be swung from its longitudinal position indicated in dottedl'ines. inFig.1 16

to the full line position illustrated in tha figure in which, by reasonof the movement of the portion 123 of the-pin into the;

recess 124, the bar: will he automatic-idly locked, After the bar hasbeen thus adjust ed the chain is then disconnected from the hookandconnected as shown infu'll lines inv F l6,'the same then only beingreversed relative to the member can and then disposed laterally inadvance of. the machine to a fixed abutment,- wherenpon, by similarlyoperating the hand wheel 223, the machinewill move along the face atslow or cutting speed. If on the other hand it is: desired for themachine to cut in the opposite; direction relativeto the sa-mezface,itwill be evident that by rearranging the parts as shown in Fig; 17 thesame results may be. obtained, the chain being extended along the. innersurface. of 233 and theoater surface of 235130 swing the, bar, and alongthe inner surfaces of 233 and- 235 to. anchor it. for transversecutting. Further, it'will be evident that if it is: desired to cut in anop-positely located face, the same results: may be. obtained byarranging the parts reversely as shown in Fig'. l8- lV[oreo.ver, when itis desired for any reason to reverse: the slow feed, this may beaccomplished; by re-arrang ing the feed chain relativeto the guidesprockets in. such manner as. Without reversing the direction ofrotation of the feed operating member 128 to obtain the reverse slowfeed desired, this arrangement being illustrated in Fig. 19 andobviously being the same as. in 16,. save that the machineli s moving inthe, opposite direction. Attention is also here directed to Fig. 20wherein it. will be noted that the feeding: means is extendedlongitudinally from one of the guides; 228, 233 as; may be done when itis desired to move the machine, at fast speed about the mine, the.aria-tngcnremt here.- being such that thepulll is exerted nearer thelongitudinal center lineof the machine. Referring to Fig. 2-3 itwill'also-benoted that where it. is. desired to extend a rib, it ispossiblewhen the bar is laterally disposed as shown, by extendingthe chainalong. the inner side o-f-the guide 233 and the outer side of 235 andalong the: machine to: a fined jack at. the rib as shown, to draw thebar into the face to the suniped' inzposition indicated in dotted lines,and thereafter by disconnecting the: chai-nfrom the jack and passing itaround the outside; of the guides 285, 233, and 22-8 and around theinside of the guide. 234, then extentit late ally along the face toenable the machine to make the transverse cut, this. Without reversingthe. motor and without requiring any swinging of the bar. linFig.24,;it. will also be noted that the rib may be'extended by leaving thebar longitudinally disposed as shown in that figure and extending thechain along the inner side of 233 and to the outer'side of same a jackat the rib, whereupon the bar may move longitudinally into the face andthe machine frame then be swung laterally relative to'the bar into its.usual position. parallel to the face. In swingingthe frame, the bar isfirst unlocked, preferably man.- ually, andthe; free.- end of the chainextended along the inner side of 228' and the outer side of234 to ajackadjacent the face as in dicated, whereupon by operating' the fast feedtlie'frame may "be swung rapidly toward its dotted line positionindicated at the left. When thelbar and frame are disposed in thistransverse cutting position, the bar is then again locked in" positionand the chain then arranged as shown, the same extend iiig' around themember 233 and along the outer-side thereof to the iiien'iber 228 and"then along the inner side of the member 234; to the jack or abutmentadjacent the face so that the machine may be fed along the chain at aslow or cutting feed. InFig. 25, I have also shown the machine adaptedto use as aroom and pillar machine eXtending a rib as in a heading. Inthis construction it will be noted'that a swing a-rmzorsupplementaryguide of any usual form" is suitablyattached to the fronthead in any usual manner. It will also be notedthat the bar being leftlongitudinally disposed, the chain is extended during sumping alongthe'inner surface of 233 and theouter surface of 235 to a jacket attherib as in Fig.

i 24. After the suinping operation, the chain is disconnected from thejack adjacent the rib and then extended 'along'the inner sur face of 233and the outer surface of 283, 228, v and 234:, longitudinally along theframe and then around the guide 239 to a laterally located jack adjacentthe face, to effect lateral iiio'vement of the'inachin'e to extend theheading. I a

As a result of my improved construction it will be observed that anexceedingly compact machine vertically is produced, my'ims p-rovedconstruction in. fact enabling a machinehaving a total height of 12'inches to be produced, a far. lower machine than has heretofore beenthought possible, and one which is accordingly adapted to use in eventhe lowest commercially workable veins. Further, by reason of-theprovision of a machine equally adapted to be operated-on its top oritsbottom, it Will be 'noted that while retaining this low characteristic,a

machine is produced which is equally well adapted to use as an,overcutter or under-' cutter depending'upon the circumstancesin theparticular mine. Moreover, attention is directed to the fact that byreason of the provision of improved supply connectionsand controllingmechanism'adapted to be located upon opposite sides of the machine, thelatter is adapted td'work along a face at either side of the machinewithout injury to the connections or. inconvenience on the part of theoperator or delays of the machine, the supply connectionsand controllingmechanisms always being capable of being placed on the side ofthemachine away from the face. Attention is also directed to the fact thatthe control mechae nism'for the feed is exceedingly simple, in-'-volving only a single control member ca pable of being operated vquicklyand easily byfan operator at his stationat the advancingend of themachine frame where it Will also be noted that the operating member forthe motor throttling mechanism is'likewise conveniently located, thesetwo controlling members being the only members which in sary forjtheoperator to use. Sofar as the motor structure is concerned, it" willalso benoted that by myimproved construction it eordinaryfoperationalongthe'face it is neceshas been jniadepossible materially rtofreduce Ithe d ameter and consequent cost .of the horsepower to operate themachine and otherwise specifically improvingthe motor. It ,Will also vbeobserved that'by my im-- in otor while retaining the same of sufficientproved arrangement ofguiding means for the flexible'feeding member "ithas beenmade possible, to eliminate the necessity for connection of thefeeding mechanism to either rotor While still making available: the de-fsiredvaria'tions of feed. As for the cutting mechanism,attention isherejalso directedt-o the fact that througlrmy improved autoafter amanual release and aproper' con- 'nection of the feed chain, therebysaving considerable time in tliis-operation,-1butthat' it is also madepossible 'to util-izeflasa part of this automatic mechanismyahook whichperforms the dual"function'of a connecting and operating membe-r for thelocking mechanism" and of a safetysum'ping member preventingconflictbetween-the feed and cutter chains. Moreover, it will be observedmaticlocking means it is notonlypossible to automatically lock thecutterbar when moving in either direction in any position fee 7 that atthe same tiineflthat an exceedingly 'Liio proved arrangeinentof thesame, it will be] 1 observed that 'itis IlOtOIl ly possible to re-- ducethe manufacturing cost by duplicating a large number ofyelements, but toenable the whole mechanismto be readily accessible ing members withtheir connected parts'and the shaft being remov ble longitudinally of Ithe machine when" the rear head section is removed. Attention IS' hBIGalso directed to the fact that by my improved arrangementof'feedingparts including the internal gears, it is made possible to compact theffeeding mechanism .verticallvto-a marked I degree and that at thesametime that this-is made possible, it is also made possible to providelarge friction clutches of ample ca? pacity' well adapted to standn'punder the most severe demands ofseryice the same if need be beingcapable of be ng even. larger whenever'desired, even in lowcoahthe'spac:

thanithose 'shovvn. Theseand other advan tages of my, improvedconstruction Will, however, be clearly apparent to .thoseskilled in theart. I

VV-hile I have in this application specific'ally described one formwhich my invention may assume in practice, it will be understoodthat'this: form is shown forpurposes-of illustration and that theinvention may be modified and embodiedin various other forms and certainfea tures thereof applied to other than propelled machinesWithoutdeparting from its spirit .or the scope of the appended claims. g

Vvhat I claim asv new and desire to. secure by Letters Patent is:

l.A mining machine comprising an 111-.

vertible frame slidable over a mine bottom dur ng cutting and cuttingmechan1sm, sa1d machinebelng operable during cutting 1111111- vertedpositions to enable said cut-ting mach-t anism to operate in differentplanes and said frame having opposite surfaces. each adapted .toslidably engage the bottom and support.

the machineduring cutting and formed to permit free sliding of-saidmachine uponthe bottom. 1

2, A mining machine comprising an invertible cutter carrying frame andoperable during cutting when slidably supported on theimine bottornon.opposite surfaces thereof to enable thelm whine to cut in difierentplane's, said machine having lubricating meansadapted tofunction withequal efliciency, in inverted positions of the machine. f3..-A m1n1ngmachine comprising an .1n-.

vcr tible cutter carryingframe and operable.

during cuttingwhen slidably supportedon the mine bottom on oppositesurfaces thereof to enable the machine to cut in different planes,said.,machine having feeding and cutting. mechanism, and controllingmeans, therefor, said controlling means arranged permitsubstantiallyequally facile 'manual operation in inverted positions of the machine.

4. A [mining .machine comprising an in- I vertiblecutter carrying frameand operable during cutting when slidably supported on the'minebottom onopposite surfaces thereof to enable the machine "to cut in differentplanes, said machine having a motor and feeding mechanism, andcontrolling means therefor, said controlling means arranged to permitsubstantially equally facile manual operation 1n 1I'1VeIt6d'pOSltlO11Sof the ma;

chine. r

k .5. A mining machinev comprising an invertible cutter carryingframeand operable during cutting when slidably supportedou themine'bottom. on opposite surfaces thereof'to enable the machine to cutin' different planes, said machine having a-motor and cutting mechanism,and cont-rolling means there for, said controlling means arranged toperup turned to facilitate sliding. v

mma Y mit substantiallygequally facile manual op eration in invertedpositions of the machine.

6. A mining machine comprising a frame slidable .over a m ne bottomduring-cutt ng and cutting mechanism, said machine frame havingsubstantially coextensive opposite surfaces each constructed tosupportthe machine when engaged With the mine bottom and each having anedge, adapted to consti-,

tute a leading edge during 'machin'e feeding,

,7QA mining machine comprising an invertible cutter carrying framedisposable on the mine bottom and having opposed surfaces eachconstructed to support themachine for sliding movement over the minebottom to enable the machineto cut in different planes, said machinec0mprisingmech-- anism-operablein either position thereof.

8'. A mining machine comprising an invertible cutter carrying framedisposable on a mine b'ottomand having opposed surfaces each constructedto support the machine for sliding movement over the mine bottom toenable the machine to cut indifferent planes, said machine comprisinglubricating and controlling mechanism operable either position thereof.

vertible frame having opposed surfaces each constructed to support themachine for sliding movement over the mine bottom, said machinecomprising cut-ting mechanism operable tocut in differentplanes Whensaid frame is slidably supported on different surfaces directly on themine bottom.

9. A mining machine comprising an ini loo 1 10., A mining machinecomprising an invert-ible cutterjcarrying frame and operable to cutWith'equal facility in different planes whenslidably supported onopposite surfaces directly on the mine bottom. I v p 11. Amining machineoperable'in inverted relations relativeto a minebottom to enable themachine tocut in different planes and including flexible feedingmechanism operable ineither direction and effective to slide saidmachine over the mine bottom While a supported directly on the latter.

12. A miningmachine operable in inverted relations relative :to the minebottom to en- I .able the machine .toucut in different planes llU saidmachineover the mine bottom While directly supported on the latter, saidfeeding mechanism having controlling mechanism disposed for equallyfacile manual control in either position of said machine.

14;. A mining machine operable in inverted relations relative to a minebottom to enable the machine to cut in different planes including kerfcutting mechanism and flexible feeding mechanism operable in the planeof the latter in either relatively inverted position of the machine forfeeding the latterwhile slidably supported directly on the mine bottom,said feeding mechanism having controlling mechanism disposed for equallyfacile manual control in either position of said machine.

15. In combination, a mining machine skid slidably engageable with themine bottom, and a mining machine'thereon including a frame generallyrectangular in cross section and also including cutting mechanism andbodily invertible relative to said skid to bring opposite surfaces intoengage"- ment' withthe latter and to dispose said out- I ting mechanismin different planes, said machine having lubricating means and feedingmeans adapted for effective operation in either position of said machineon said skid, said. feeding means being adapted to feed said skidand'machine over the mine bottom during the cutting operation;

16. A mining machine operative with its opposite sides selectivelyadjacent a face and including apressure fluid motor, a supply chan'lbertherefor, a throttle valve between said supply chamber and said motor,and

pressure supply connections for the latter whereby pressure may besupplied thereto fron'r opposite sides of the machine including a rigiddetachable supply connection forming a part of the machine and extending to one end of said machme and dlsposable at either side thereof.

17. A mining machine operative with its oppositesides selectivelyadjacent a face and including a pressure fluid motor, a supply chambertherefor, and a single detachable power supply connection forming a partof thevmachine tra-nsposable to opposite sides of said machine andadapted to be secured thereto at either side thereof at longitudinallyspaced points and in each position adapted to be connected'to a powersupply line. Y

18. A mining machine operative with its opposite sides selectivelyadjacent a face and having cutting mechanism, a pressure'flui'd drivingmotor therefor comprising intermeshing rotors, and means forselectivelyconnecting said rotors to said mechanism including aplurality of operating connections on the oppositesides of said machineand adjacent said cutting mechanism.

19. A mining machine operative with its opposite sides selectivelyadjacent a face and having cutting mechanism, a pressure fluid drivingmotor therefor comprising inter meshing rotors, and means forselectively connecting said rotors to sald mechan1sm1ncluding a'plurality of operating connections .on'the opposite sides of saidmachine and adj acent'sa'id cutting mechanism and a transposiableoperating member.

20, A pressurefluid operated mining machine operative with itsoppositesides selectively j adjacent a mine face and having a pluralityof pressure'fluid supply inlets. on opposite sides thereof, and meansfor utilize ing a single pressure fluid supply connection" including atransposable supply connection forming a part of the machine anddetach-' ably secured to the side thereof and. 'having a portionextending to one end of said machine and connectable thereto at said endi and a cover for the unused inlet.

21. A mining machine having a swinging cutter chain carrying cutter'bar'and flexiblefeeding means, and automatic barlockmg means operablewithout manual intervention to lock said bar when a predeterminedposition of the latter is reached, said flexible means being connectibleto effect bar swlng with sald locking means and 1ncludmg means forpreventing contactbetween' said flexible means and said cutter chainwhen slack enters said flexible means while 1 the latter extends aboveand across'thepath of said cutter chain.

22. A mining machine having a swinging cutter chain carrying-cutter barand flexible feeding means, and automatic bar locking means movable withsai'dbar operable wlthout manual lnterventlon to lock said bar when apredetermined positionof. the latter I is reached, said flexible meansbeing connectible toeffect bar swing with said locking means andincludlng means for preventing conflict between said flexible means andsaid cutter'chain when slack enters said flexible means while the latterextends above and? across the path of said cutter chain.

723. A mining niachinehaving a swinging cutter chain carrying cutterbarand flexible feeding means, and automatic barlocking means arrangedin the central longitudinal" vertical plane ofsa-idbar'operable withoutmanual intervention to lock said bar-when a predetermined position ofthe latter is reached, said flexible means being connec tible to effectcar swing with said locking means while the latter extends above andacross the path of said cutter chain.

24. A miningmachine having a swinging. cutter chain carrying cutter barand flexible feeding means, and automatic bar locking means includlng anelement rotatable on an axis perpendicular to the plane of the bar andoperable without manual intervention to lock said bar When apredetermined position ofthe latter is reached, fle qible .meansbeingfconnect-ible to efiectbar swing with said lock ingmeans andincluding means for preventing conflict between said flexible means andsaid cutter chain when slack enters" said, flexible "means While "thelatter extends above and across the path of said cutterfchain."

25. Ina mining machine, a, frame, and cutting mechl ism thereonincluding a cut ter chain sprocket rotatably mounted thereon; a cutterbar movable about the sprocket axis as a pivot, and cutter'barjournalsc'arme d on said 'baij andcompr sing bearing sleeyes'adapted tosurround and cooperate axis 'asga pi ot and cutter bar journals car--ried onv said bar and comprising bearing sleeyes adapted to surround andcooperate with stationary bearing 'members and disposed on oppositesides of said sprocket at equal distafces from the median horizontal Plasf d ba 27(A miningmachine including a frame, and. cutting mechanismmovable. about a pivot thereon includinga pivoted bar having ajoiirnalthereon and a removable barmember attachdtosaidbar'and carrying acooperating r'journa'hsaid journals being at equal distances from themedian horizontal. plane of said bar.

, 28, Aminin machine including a frame; having on itseicterlorf anarcuate portion ex t'endingto the sides thereof, and [cutting mechanismthereon includlng'a swmgin'gbar pivoted thereon midway between the sidesOf'said' frameisaidfbm? being swing ableptoi either side ofthe machineand provided With axially spaced pivotal supporting means and anupstanding boss of short circumferential extent overlying and: duringswinging mo'ye'f ment cooperating 'With said portion to maintain the barthe desired plane ofswinm 29. Mining 'machine cutting mechanismcomprising a horizontal beveledfgear, a spur pinion above, and coaxialtherewith, a larger spur gear meshing With said pinion, and a cutterchain driving SPlOCkQi} below and rotatable With said larger gear, saidcutter chain drivingsprocket havinga bearing therefor below-the latter.

30. A mining mach'ne cutting mechanism including'a power driven gear, acoaxially v disposed cutter chain'driving sprocket 'rotat abletliereivith, a coaxially disposed stud extendingthrough each or thesame, anti;

friction bearings between said gear and stud re sai Sweet e he S a eally "suppose coaxialllyj was said et"rotatablerwith said gear, bearings,ciitterbarp vqtr f r A i in ns ma h n su t-item I a lm including apo'WendriYngear, a" coaxiallv spo ed t r Ch n s r cket 'eaf li f aelements having interengaging sl'eyes and a fi' e r being x a lyfir jnrab and! journaljsleeye enclosing said; sleei esi and re? movableaxially upon "Xial removal of said].

A cutting mechanism for mining ma; chines including an axiallyremovable'gear, a coa'xi al stud, a coaxialcutterchain spiderdinally oithe latter, and

po e wa a y W ai -me ed, 'a ii QQ axia l cup bearing for 'safdfspfcket.I n n mil i gn ma ine, I ram -ha n a utt n pa ag a t erl'cha T's we?.journaled in said passage, and {feari g means for said sprocketincluding a plur ity of members removable thro afwa'lloi; saidpassageand a cup inemb r the bottom of said p'assagei'whereby up oni removal ofsaid plurality of members said" sprocket may be removed I said passage.1

n a i 'ma ne, f ame ha n 'means forming-fa cuttings pass age and achamber above the samepa sprocket journaled in said passage,-a'pivotedxbarha ving journals coaxial With said sproekehfdriving andbearing mechanism in said chamberre movableaxially of sprocket to permittransverse ithdrawal of saidlsprocket'and bar, and means including aremovablechain ber-closing plate'whe'reb said driving bearing mechanismmay erem'ojved. 35 A miningimachine comprisingcutting and feedingmechanism; a motor operatii ely" connected thereto comprisinglinter'meshing '105 rotors dis iised in the same horizontal:

P e a dha ns a upr ht. n and controllingfnieclianisni operable from oneend (if said machine including a throttle" valvedisposedfinsaid inlet."i 86. mining machine comprising cutting d edin d aln s a d." a: e motorincluding casing, intermelshingrotors therein hating shafts operativelycon; nected to said mechanisms, 'anddetachable heads disip osed' withinthe peripheries of the ends'of'said'casi'ng and on Whichsaid shafts arejournaled, the adjacent ends oi said I shafts bje'ing journaled'inonehead f 37. A mining machinecomprising cutting. and feeding f echanism, and i a vpressure fluid motor 1 operatively connected theretoincliiding, a cas ing haying therein intermeshing rotors with theirperipheries extending to? Point subs an a ly eq ally b' ly adjacent thetop and bottom of said casing, and ex} haust passages from saidrotorsinthe sides of said-casing.

' 38. A m1n ng machine comprising cutting mechanism, and drivingmechanism therefor;

